http://fmhq.mustangfreak.us/ - A great Fighter Maker site.  There's a downloads section within the forums where you can find sprites, and stages.

http://proof58.silverfirebird.com/index2.php?page=welcome - Another site, with forums and such.  One of the best programmers, Proof, created this site.

http://fm.silverfirebird.com/ - Here, you can download games, demos, and other media pertaining to Fighter Maker. 

http://hyperstrike.silverfirebird.com/index.html - This is a project site made by the great Darkphoenix, the very same person who created the site above this.

http://tenukosprites.tripod.com/ - A good place to find some sprites, also try looking in the forums.

http://www.freewebs.com/chuji3/ - Another programmer, Freeter's site which has info on his projects along with a few helpful tutorials.

http://fm2002ita.altervista.org/portale/index.php- This is a site for the Fighter Maker community in Italy.  Pretty good place for some resources too.

http://fightermaker.fateback.com/ - Yet another nice site for the community in Argentina.